Ionospheric products of Taiwan Radio Occultation Process System (TROPS) for FORMOSAT-7/COSMIC-2 mission

With the advent of Global Positioning System (GPS), global distribution observation of ionosphere can be study by Radio Occultation (RO) technique. In 2006, Taiwan has launched six low Earth orbit (LEO) satellites as a RO constellation mission, named FORMOSAT-3/COSMIC (F-3/C). F-3/C mission can release 1500-2500 data sets per day for both neutral atmosphere and ionosphere. Due to the success of F-3/C, the follow on mission launched six LEO satellite for RO in late June, 2019, named FORMOSAT-7/COSMIC-2 (F-7/C-2). For data processing of F-7/C-2, the Taiwan-built data process system has developed by National Space Organization (NSPO), Taiwan Analysis Center for COSMIC (TACC), and GPS Science and Application Research Center (GPSARC), named Taiwan Radio Occultation Process System (TROPS). TROPS is a process system including the retrieval procedure for atmosphere and ionosphere and user interface. In this study, the preliminary retrieve results of TROPS for ionosphere will be introduced.